the atria of the heart: a) are located superiorly and are the receiving chambers of the heart b) are located inferiorly and are the receiving chambers of the heart c) are locates superiorly and are the discharging chambers of the heart d) are located inferiorly and are the discharging chambers of the heart e) are located posteriorly and are the discharging chambers of the heart

which of the following areas receives blood directly from the four pulmonary veins: a) lungs b) right atrium c) right ventricle d) left atrium e) left ventricle

which of the following blood vessels is NOT part of the systemic circulation: a) coronary arteries b) aorta c) inferior vena cava d) carotid arteries e) pulmonary arteries

the mitral valve prevents blood from flowing from the: a) right ventricle to the right atrium b) left ventricle to the left atrium c) left atrium to the right atrium d) right atrium to the left atrium e) left ventricle to the right ventricle

the tricuspid valve is located between the: a) right atrium and left atrium b) right atrium and right ventricle c) right ventricle and left ventricle d) left atrium and left ventricle e) right ventricle and the pulmonary trunk

the superior vena cava empties: a) oxygenated blood into the left atrium b) oxygenated blood into the left ventricle c) deoxygenated blood into the right atrium d) deoxygenated blood into the right ventricle e) deoxygenated blood into the left atrium

an increase in parasympathetic nervous system activity causes: a) a decrease in heart rate and cardiac output b) a decrease in heart rate and an increase in cardiac output c) an increase in heart rate and cardiac output d) an increase in heart rate and a decrease in cardiac output e) no change in heart rate and cardiac output

compared to an artery, the wall of a vein differs in which of the following ways: a) it contains smooth muscle b) it consists of three layers c) the middle layer is thin d) the outer layer is composed largely of collagen fibers e) it is lined by a thin layer of endothelium

a decrease in venous return to the heart causes: a) a decrease in stroke volume and a decrease in cardiac output b) a decrease in stroke volume and an increase in cardiac output c) an increase in stroke volume and an increase in cardiac output d) an increase in stroke volume and a decrease in cardiac output e) no change in stroke volume and no change in cardiac output

the umbilical vein carries a) metabolic wastes and carbon dioxide from the fetus to the placenta b) metabolic wastes and carbon dioxide from the placenta to the fetus c) oxygen and foods from the fetus to the placenta d) oxygen and foods from the placenta to the fetus e)blood from the navel into the inferior vena cava

in which of the following blood vessels is the blood pressure the highest: a) veins b) capillaries c) vena cava d) arteries e) arterioles

vasoconstriction occurs as a result of: a) an increase in parasympathetic nervous system firing b) a decrease in parasympathetic nervous system firing c) an increase in sympathetic nervous system firing d) a decrease in sympathetic nervous system firing e) an increase in blood volume

which of the following is the function of renin and aldosterone: a) they are produced whenever blood pressure rises and ultimately cause an increase in blood volume and blood pressure b) they are produced whenever blood pressure rises and ultimately cause a decrease in blood volume and blood pressure c) they are produced when blood pressure rises and have no long-term effect on blood volume and blood pressure d) they are produced whenever blood pressure falls and ultimately cause an increase in blood volume and blood pressure e) they are produced whenever blood pressure falls and ultimately cause a decrease in blood volume an blood pressure

substances tend to leave the bloodstream at the arterial end of the capillary because a) the osmotic pressure of the blood is higher at the arterial end of the capillary b) the osmotic pressure of the blood is higher at the venous end of the capillary c) blood pressure is higher at the arterial end of the capillary d) blood pressure is higher at the venous end of the capillary e) interstitial pressure is higher at the arterial end of the capillary